Preheat oven to 350 degrees F. Coat a 9-by-13-inch glass baking dish with nonstick cooking spray.
In a medium bowl, combine the Catalina dressing, onion soup mix, cranberry sauce, and red pepper flakes. Blend well. Pour into the baking dish.
Season the chicken thighs on both sides with salt and pepper and place in the baking dish, in a single layer, making sure all the chicken is coated well with the sauce.
Bake, uncovered, for 1 hour (or until the chicken has an internal temperature of 165°F.)
Serve over mashed potatoes, sweet potatoes, or rice.
Video
Notes
Easy swaps! If you can't find Catalina dressing, you can use Russian salad dressing instead. Apricot preserves can be used in place of the cranberry sauce, and chicken breasts can be used instead of chicken thighs, if preferred.